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The level of noise entering a person’s ear, when hearing
protector is worn as directed, is closely approximated by
the difference between the A-weighted environmental noise
level and the NRR.
Example
1. The environmental noise level as measured at the ear is
92dB(A).
2. The NRR is 25 decibels (dB).
3. The level of noise entering the ear is approximately equal
to [92dB(A) – 25dB] dB(A).
Caution: For noise environments dominated by frequencies
below 500 Hertz (Hz), the C-weighted environmental noise
levels should be used.
Improper fit of this device will reduce its effectiveness in
attenuating noise. Consult the enclosed instructions for
proper fit.
Although hearing protectors can be recommended for
protection against the harmful effects of impulsive noise, the
Noise Reduction Rating (NRR) is based on the attenuation of
continuous noise and may not be an accurate indicator of the
protection attainable against impulsive noise such as gunfire.
NOISE PROTECTION INFORMATION
REQUIRED INFORMATION
TECHNICAL SPECIFICATIONS
BEHIND-THE-EAR
Peak Gain 30dB
Peak Output 95dB
Attenuation Data
Measurements were made according to American National
Standards Institute Specifications ANSI S3. 19-1974.
NRR = 26dB
Total Frequency
(Hz)
Mean Attenuation
(dB)
Standard Deviation
(dB)
125 26.9 5.6
250 28.1 4.0
500 33.7 3.3
1000 36.0 3.7
2000 35.8 4.4
3150 39.6 3.5
4000 40.3 4.2
6300 42.4 3.5
8000 43.7 4.5
48 49
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